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| Format: | Artículo científico |
| Language: | en |
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Universitat de Barcelona
2006
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| Online Access: | https://www.redalyc.org/articulo.oa?id=50540204 |
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Table of Contents:
- High pressure metamorphism of ophiolites in Cuba A. García-Casco R.L. Torres-Roldán G. Millán K. Núñez Cambra M. A. Iturralde-Vinent C. Lázaro A. Rodríguez Vega Ciencias de la Tierra High pressure Ophiolite Caribbean Subduction High-pressure metamorphic complexes of ophiolitic material in Cuba trace the evolution of the northern marginof the Caribbean Plate during the Mesozoic. In the northern ophiolite belt of western and central Cuba, thesecomplexes document cold (i.e., mature) subduction of oceanic lithosphere. Age data indicate subduction duringpre-Aptian times followed by mélange formation and uplift during the Aptian-Albian. The P-T evolution isclockwise with relatively hot geothermal gradient during exhumation (i.e., Alpine-type), suggesting thatexhumation may have been triggered by unroofing processes ensuing arrest of subduction. It is hypothesizedthat tectonic processes related to termination of subduction led to formation of characteristic oscillatory zoningof garnet recorded in blocks separated by ca. 800 km along strike of the belt. In eastern Cuba, the complexesdocument hot subduction with peak conditions at ca. 750 ºC, 15-18 kbar followed by near-isobaric cooling (i.e.,counterclockwise P-T path). The contrasting petrologic evolution in the two regions indicates that the correlationof eastern and western-central Cuban mélanges is doubtful. The age and tectonic context of formation ofthese hot-subduction complexes is uncertain, but available data are consistent with formation during the Aptian-Albian due to a) the birth of a new subduction zone and/or b) subduction of young oceanic lithosphere or aridge. Furthermore, tectonic juxtaposition of high-pressure ophiolitic material and subducted platform metasedimentsin the Escambray complex (central Cuba) that were decompressed under relatively cold geothermal gradients(Franciscan-type P-T paths) indicates syn-subduction exhumation during the uppermost Cretaceous(ca. 70 Ma). The diversity of P-T paths, ages and tectonic settings of formation of the high-pressure complexesof ophiolitic material in Cuba document a protracted history of subduction at the northern margin of theCaribbean Plate during the Mesozoic. 2006 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50540204 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.1-2 Vol.4